For the name resolving issue, you should check whether you have your router's IP in /etc/resolv.conf, or are there really the dns-servers' IPs.
It usually helps to have the real DNS-addresses there.
I've never had any speed issues when comparing linux and windows, and it doesn't seem very probable that the linux drivers for your network card would decrease your download rate, considering you have a 10/100 card and 170kB/s isn't anywhere near 100Mbit/s (nor 10Mbit/s).
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